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Isa Brown hens were divided into five groups, each with 12 replications, i.e. cages with 3 birds each. The isoprotein and isoenergetic diets (about 160 g crude protein and 11.3 MJ ME/kg) differed in their contents of spray-dried porcine blood plasma (SDBP) or spray-dried blood cells (SDBC), which amounted to 2 or 4%. Control birds were fed a diet containing plant proteins only. Laying performance...
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